New Smooth Projective Hash Functions and One-Round Authenticated Key Exchange

Provided by: International Association for Cryptologic Research
Topic: Security
Format: PDF
Password-Authenticated Key Exchange (PAKE) has received deep attention in the last few years, with a recent improvement by the researchers, and their one-round protocols: the two players just have to send simultaneous flows to each other, which depend on their own passwords only, to agree on a shared high entropy secret key. To this aim, they followed the gennaro and lindell's approach, with a new kind of Smooth-Projective Hash Functions (SPHFs). They came up with the first concrete one-round PAKE, secure in the bellare, pointcheval, and rogaway's model, but at the cost of a simulation-sound NIZK, which makes the overall construction not really efficient.

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